What's a synonym and antonym for allele

What are two reasons for why a species might disappear from the fossil record?

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

The mixture of sperm and fluids from the seminal vesicles, prostate gland, and cowper's glands is called